package main

import (
	"context"
	"database/sql"
	"encoding/csv"
	"encoding/json"
	"errors"
	"flag"
	"fmt"
	"os"
	"strings"
	"time"

	_ "github.com/go-sql-driver/mysql"

	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/identity"
	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/stats"
)

func main() {
	var input string
	var dsn string
	var legacyTable string
	var apply bool
	var ensureSchema bool
	var reportLimit int
	var unresolvedOut string
	var conflictsOut string
	var syncDataSources bool
	var pruneUnmanagedDataSources bool
	var pruneDataSourceMinAge time.Duration
	var retireStaleUnmanagedDataSources bool
	var retireDataSourceMinAge time.Duration
	var timeout time.Duration
	flag.StringVar(&input, "input", env("IDENTITY_MAPPING_INPUT", ""), "directory that contains 808 plate/phone mapping workbooks")
	flag.StringVar(&dsn, "mysql-dsn", env("IDENTITY_MYSQL_DSN", env("MYSQL_DSN", "")), "MySQL DSN; empty means scan only")
	flag.StringVar(&legacyTable, "legacy-table", env("VEHICLE_IDENTITY_TABLE", "vehicle_identity_binding"), "legacy VIN/plate binding table used to resolve VIN")
	flag.BoolVar(&apply, "apply", false, "write resolved mappings to vehicle and vehicle_identifier")
	flag.BoolVar(&ensureSchema, "ensure-schema", false, "create vehicle and vehicle_identifier tables before import")
	flag.IntVar(&reportLimit, "report-limit", 50, "max unresolved/conflict items embedded in JSON; use -1 for all")
	flag.StringVar(&unresolvedOut, "unresolved-out", "", "optional CSV path for all unresolved mappings")
	flag.StringVar(&conflictsOut, "conflicts-out", "", "optional CSV path for all conflict mappings")
	flag.BoolVar(&syncDataSources, "sync-data-sources", false, "infer JT808 vehicle_data_source platform names from jt808_registration and vehicle_identifier")
	flag.BoolVar(&pruneUnmanagedDataSources, "prune-unmanaged-data-sources", false, "delete stale unclassified vehicle_data_source rows that have no registration evidence and are not referenced by final mileage")
	flag.DurationVar(&pruneDataSourceMinAge, "prune-data-source-min-age", time.Hour, "minimum latest_seen/updated age before -prune-unmanaged-data-sources can delete rows")
	flag.BoolVar(&retireStaleUnmanagedDataSources, "retire-stale-unmanaged-data-sources", false, "disable stale unclassified vehicle_data_source rows that have no registration evidence but may be referenced by historical mileage")
	flag.DurationVar(&retireDataSourceMinAge, "retire-data-source-min-age", 24*time.Hour, "minimum latest_seen/updated age before -retire-stale-unmanaged-data-sources can disable rows")
	flag.DurationVar(&timeout, "timeout", 2*time.Minute, "import timeout")
	flag.Parse()

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()

	input = strings.TrimSpace(input)
	output := map[string]any{}
	var records []identity.MappingRecord
	var scan identity.MappingScanReport
	if input != "" {
		var err error
		records, scan, err = identity.ReadMappingDirectory(input)
		if err != nil {
			fail(err)
		}
		output["input"] = input
		output["scan"] = scan
	} else if !syncDataSources && !pruneUnmanagedDataSources && !retireStaleUnmanagedDataSources {
		fail(errors.New("-input is required unless -sync-data-sources, -prune-unmanaged-data-sources or -retire-stale-unmanaged-data-sources is set"))
	}
	if err := validateMappingApplyInput(apply, scan); err != nil {
		fail(err)
	}
	if strings.TrimSpace(dsn) == "" {
		if syncDataSources || pruneUnmanagedDataSources || retireStaleUnmanagedDataSources {
			fail(errors.New("-mysql-dsn is required when -sync-data-sources, -prune-unmanaged-data-sources or -retire-stale-unmanaged-data-sources is set"))
		}
		output["mode"] = "scan_only"
		writeJSON(output)
		return
	}

	db, err := sql.Open("mysql", dsn)
	if err != nil {
		fail(err)
	}
	defer func() { _ = db.Close() }()
	if err := db.PingContext(ctx); err != nil {
		fail(err)
	}
	if input != "" && (ensureSchema || apply) {
		if err := identity.EnsureVehicleIdentifierSchema(ctx, db); err != nil {
			fail(err)
		}
	}
	if input != "" {
		report, err := identity.ImportMappingRecords(ctx, db, records, scan, identity.MappingImportOptions{
			Apply:           apply,
			LegacyTable:     legacyTable,
			ReportItemLimit: reportItemLimit(reportLimit, unresolvedOut, conflictsOut),
		})
		if err != nil {
			fail(err)
		}
		if strings.TrimSpace(unresolvedOut) != "" {
			if err := writeUnresolvedCSV(unresolvedOut, report.UnresolvedItems); err != nil {
				fail(err)
			}
		}
		if strings.TrimSpace(conflictsOut) != "" {
			if err := writeConflictsCSV(conflictsOut, report.ConflictItems); err != nil {
				fail(err)
			}
		}
		output["report"] = report
		output["mode"] = map[bool]string{true: "apply", false: "dry_run"}[apply]
	}
	if syncDataSources {
		syncReport, err := syncJT808DataSourcesFromIdentifiers(ctx, db, apply)
		if err != nil {
			fail(err)
		}
		output["data_source_sync"] = syncReport
	}
	if pruneUnmanagedDataSources {
		pruneReport, err := pruneUnmanagedDataSourcesWithoutEvidence(ctx, db, apply, pruneDataSourceMinAge)
		if err != nil {
			fail(err)
		}
		output["data_source_prune"] = pruneReport
	}
	if retireStaleUnmanagedDataSources {
		retireReport, err := retireStaleUnmanagedDataSourcesWithoutEvidence(ctx, db, apply, retireDataSourceMinAge)
		if err != nil {
			fail(err)
		}
		output["data_source_retire"] = retireReport
	}
	if input == "" {
		output["mode"] = maintenanceMode(apply, syncDataSources, pruneUnmanagedDataSources, retireStaleUnmanagedDataSources)
	}
	writeJSON(output)
}

func maintenanceMode(apply bool, syncDataSources bool, pruneUnmanagedDataSources bool, retireStaleUnmanagedDataSources bool) string {
	var parts []string
	if syncDataSources {
		parts = append(parts, "sync")
	}
	if pruneUnmanagedDataSources {
		parts = append(parts, "prune")
	}
	if retireStaleUnmanagedDataSources {
		parts = append(parts, "retire")
	}
	if len(parts) == 0 {
		return map[bool]string{true: "apply", false: "dry_run"}[apply]
	}
	parts = append(parts, map[bool]string{true: "apply", false: "dry_run"}[apply])
	return strings.Join(parts, "_")
}

func reportItemLimit(limit int, unresolvedOut string, conflictsOut string) int {
	if strings.TrimSpace(unresolvedOut) != "" || strings.TrimSpace(conflictsOut) != "" {
		return -1
	}
	return limit
}

func validateMappingApplyInput(apply bool, scan identity.MappingScanReport) error {
	if !apply {
		return nil
	}
	return unsupportedMappingFilesError(scan)
}

func unsupportedMappingFilesError(scan identity.MappingScanReport) error {
	if scan.UnsupportedFiles <= 0 {
		return nil
	}
	items := make([]string, 0, len(scan.UnsupportedItems))
	for _, item := range scan.UnsupportedItems {
		path := strings.TrimSpace(item.File)
		if path == "" {
			path = strings.TrimSpace(item.Ext)
		}
		if path != "" {
			items = append(items, path)
		}
		if len(items) >= 3 {
			break
		}
	}
	suffix := ""
	if len(items) > 0 {
		suffix = ": " + strings.Join(items, ", ")
	}
	return fmt.Errorf("identity mapping import has %d unsupported workbook(s); convert .xls/.xlsb to .xlsx before -apply%s", scan.UnsupportedFiles, suffix)
}

func env(key string, fallback string) string {
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return fallback
	}
	return value
}

func writeJSON(value any) {
	encoder := json.NewEncoder(os.Stdout)
	encoder.SetIndent("", "  ")
	if err := encoder.Encode(value); err != nil {
		fail(err)
	}
}

func writeUnresolvedCSV(path string, items []identity.MappingRecord) error {
	file, err := os.Create(path)
	if err != nil {
		return err
	}
	defer file.Close()
	writer := csv.NewWriter(file)
	defer writer.Flush()
	if err := writer.Write([]string{
		"file", "sheet", "row", "source_code", "source_name", "protocol",
		"identifier_type", "identifier_value", "raw_value", "plate", "oem", "reason",
	}); err != nil {
		return err
	}
	for _, item := range items {
		if err := writer.Write([]string{
			item.File,
			item.Sheet,
			fmt.Sprint(item.Row),
			item.SourceCode,
			item.SourceName,
			item.Protocol,
			item.IdentifierType,
			item.IdentifierValue,
			item.RawValue,
			item.Plate,
			item.OEM,
			"vin_not_found_in_legacy_binding",
		}); err != nil {
			return err
		}
	}
	return writer.Error()
}

func writeConflictsCSV(path string, items []identity.MappingConflict) error {
	file, err := os.Create(path)
	if err != nil {
		return err
	}
	defer file.Close()
	writer := csv.NewWriter(file)
	defer writer.Flush()
	if err := writer.Write([]string{
		"file", "sheet", "row", "source_code", "source_name", "protocol",
		"identifier_type", "identifier_value", "raw_value", "plate", "oem",
		"existing_vin", "new_vin", "reason",
	}); err != nil {
		return err
	}
	for _, item := range items {
		record := item.Record
		if err := writer.Write([]string{
			record.File,
			record.Sheet,
			fmt.Sprint(record.Row),
			record.SourceCode,
			record.SourceName,
			record.Protocol,
			record.IdentifierType,
			record.IdentifierValue,
			record.RawValue,
			record.Plate,
			record.OEM,
			item.ExistingVIN,
			item.NewVIN,
			item.Reason,
		}); err != nil {
			return err
		}
	}
	return writer.Error()
}

type dataSourceSyncReport struct {
	Apply                          bool  `json:"apply"`
	CandidateSources               int64 `json:"candidate_sources"`
	SkippedSources                 int64 `json:"skipped_sources"`
	ConflictingSources             int64 `json:"conflicting_sources"`
	PlatformKindCandidates         int64 `json:"platform_kind_candidates"`
	PlatformKindClassified         int64 `json:"platform_kind_classified,omitempty"`
	ReprojectDailyMileageTargets   int64 `json:"reproject_daily_mileage_targets,omitempty"`
	ReprojectedDailyMileageTargets int64 `json:"reprojected_daily_mileage_targets,omitempty"`
	Synced                         int64 `json:"synced,omitempty"`
}

type dailyMileageProjectionTarget struct {
	VIN      string
	StatDate string
	Protocol envelope.Protocol
}

type dataSourcePruneReport struct {
	Apply            bool  `json:"apply"`
	MinAgeSeconds    int64 `json:"min_age_seconds"`
	CandidateSources int64 `json:"candidate_sources"`
	Pruned           int64 `json:"pruned,omitempty"`
}

type dataSourceRetireReport struct {
	Apply            bool  `json:"apply"`
	MinAgeSeconds    int64 `json:"min_age_seconds"`
	CandidateSources int64 `json:"candidate_sources"`
	Retired          int64 `json:"retired,omitempty"`
}

func syncJT808DataSourcesFromIdentifiers(ctx context.Context, db *sql.DB, apply bool) (dataSourceSyncReport, error) {
	report := dataSourceSyncReport{Apply: apply}
	var err error
	report.CandidateSources, err = queryInt64(ctx, db, syncJT808DataSourcesCandidateCountSQL)
	if err != nil {
		return report, err
	}
	report.SkippedSources, err = queryInt64(ctx, db, syncJT808DataSourcesSkippedCountSQL)
	if err != nil {
		return report, err
	}
	report.ConflictingSources, err = queryInt64(ctx, db, syncJT808DataSourcesConflictCountSQL)
	if err != nil {
		return report, err
	}
	if apply {
		result, err := db.ExecContext(ctx, syncJT808DataSourcesSQL)
		if err != nil {
			return report, err
		}
		rowsAffected, err := result.RowsAffected()
		if err == nil {
			report.Synced = rowsAffected
		}
	}
	report.PlatformKindCandidates, err = queryInt64(ctx, db, classifyConfiguredDataSourcesCountSQL)
	if err != nil {
		return report, err
	}
	if apply {
		result, err := db.ExecContext(ctx, classifyConfiguredDataSourcesSQL)
		if err != nil {
			return report, err
		}
		rowsAffected, err := result.RowsAffected()
		if err == nil {
			report.PlatformKindClassified = rowsAffected
		}
	}
	targets, err := queryDailyMileageProjectionTargets(ctx, db)
	if err != nil {
		return report, err
	}
	report.ReprojectDailyMileageTargets = int64(len(targets))
	if apply {
		for _, target := range targets {
			if err := stats.ProjectDailyMileage(ctx, db, target.VIN, target.StatDate, target.Protocol); err != nil {
				return report, err
			}
			report.ReprojectedDailyMileageTargets++
		}
	}
	return report, nil
}

func queryDailyMileageProjectionTargets(ctx context.Context, db *sql.DB) ([]dailyMileageProjectionTarget, error) {
	rows, err := db.QueryContext(ctx, reprojectSelectableDailyMileageSourcesSQL)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var targets []dailyMileageProjectionTarget
	for rows.Next() {
		var target dailyMileageProjectionTarget
		var protocol string
		if err := rows.Scan(&target.VIN, &target.StatDate, &protocol); err != nil {
			return nil, err
		}
		target.Protocol = envelope.Protocol(strings.TrimSpace(protocol))
		if strings.TrimSpace(target.VIN) != "" && strings.TrimSpace(target.StatDate) != "" && strings.TrimSpace(string(target.Protocol)) != "" {
			targets = append(targets, target)
		}
	}
	return targets, rows.Err()
}

func pruneUnmanagedDataSourcesWithoutEvidence(ctx context.Context, db *sql.DB, apply bool, minAge time.Duration) (dataSourcePruneReport, error) {
	if minAge < 0 {
		minAge = 0
	}
	minAgeSeconds := int64(minAge.Seconds())
	report := dataSourcePruneReport{Apply: apply, MinAgeSeconds: minAgeSeconds}
	var err error
	report.CandidateSources, err = queryInt64WithArgs(ctx, db, pruneUnmanagedDataSourcesCountSQL, minAgeSeconds)
	if err != nil {
		return report, err
	}
	if !apply {
		return report, nil
	}
	result, err := db.ExecContext(ctx, pruneUnmanagedDataSourcesSQL, minAgeSeconds)
	if err != nil {
		return report, err
	}
	rowsAffected, err := result.RowsAffected()
	if err == nil {
		report.Pruned = rowsAffected
	}
	return report, nil
}

func retireStaleUnmanagedDataSourcesWithoutEvidence(ctx context.Context, db *sql.DB, apply bool, minAge time.Duration) (dataSourceRetireReport, error) {
	if minAge < 0 {
		minAge = 0
	}
	minAgeSeconds := int64(minAge.Seconds())
	report := dataSourceRetireReport{Apply: apply, MinAgeSeconds: minAgeSeconds}
	var err error
	report.CandidateSources, err = queryInt64WithArgs(ctx, db, retireStaleUnmanagedDataSourcesCountSQL, minAgeSeconds)
	if err != nil {
		return report, err
	}
	if !apply {
		return report, nil
	}
	result, err := db.ExecContext(ctx, retireStaleUnmanagedDataSourcesSQL, minAgeSeconds)
	if err != nil {
		return report, err
	}
	rowsAffected, err := result.RowsAffected()
	if err == nil {
		report.Retired = rowsAffected
	}
	return report, nil
}

func queryInt64(ctx context.Context, db *sql.DB, query string) (int64, error) {
	return queryInt64WithArgs(ctx, db, query)
}

func queryInt64WithArgs(ctx context.Context, db *sql.DB, query string, args ...any) (int64, error) {
	var count int64
	err := db.QueryRowContext(ctx, query, args...).Scan(&count)
	return count, err
}

const jt808DataSourceInferenceSQL = `
  SELECT
    'JT808' AS protocol,
    TRIM(r.source_ip) AS source_ip,
    MAX(TRIM(r.source_endpoint)) AS latest_source_endpoint,
    MIN(COALESCE(NULLIF(TRIM(vi.oem), ''), NULLIF(TRIM(vi.source_code), ''))) AS platform_name,
    MIN(NULLIF(TRIM(vi.source_code), '')) AS source_code,
    MIN(COALESCE(r.first_registered_at, r.latest_registered_at, r.latest_authenticated_at, r.latest_seen_at, r.updated_at, CURRENT_TIMESTAMP)) AS first_seen_at,
    MAX(COALESCE(r.latest_seen_at, r.latest_authenticated_at, r.latest_registered_at, r.updated_at, CURRENT_TIMESTAMP)) AS latest_seen_at,
    COUNT(DISTINCT COALESCE(NULLIF(TRIM(vi.oem), ''), NULLIF(TRIM(vi.source_code), ''))) AS platform_count,
    COUNT(DISTINCT NULLIF(TRIM(vi.source_code), '')) AS source_code_count
  FROM jt808_registration r
  JOIN vehicle_identifier vi
    ON vi.protocol = 'JT808'
   AND vi.identifier_type = 'JT808_PHONE'
   AND vi.identifier_value = r.phone
   AND vi.enabled = 1
  WHERE r.source_endpoint IS NOT NULL
    AND TRIM(r.source_endpoint) <> ''
    AND r.source_ip IS NOT NULL
    AND TRIM(r.source_ip) <> ''
  GROUP BY TRIM(r.source_ip)
`

const jt808DataSourceCandidateWhereSQL = `inferred.source_ip IS NOT NULL
  AND inferred.source_ip <> ''
  AND inferred.platform_name IS NOT NULL
  AND inferred.platform_name <> ''
  AND inferred.platform_count = 1
  AND inferred.source_code_count = 1`

const jt808DataSourceNeedsSyncWhereSQL = `(ds.id IS NULL
  OR ds.platform_name IS NULL OR TRIM(ds.platform_name) = ''
  OR ds.source_code IS NULL OR TRIM(ds.source_code) = ''
  OR ds.source_kind IS NULL OR TRIM(ds.source_kind) = '' OR ds.source_kind = 'UNKNOWN'
  OR (ds.enabled = 0 AND (ds.remark LIKE 'auto-retired:%' OR ds.remark = 'auto-reenabled: source evidence restored')))`

const syncJT808DataSourcesSQL = `
INSERT INTO vehicle_data_source
  (protocol, source_ip, latest_source_endpoint, platform_name, source_code, source_kind, first_seen_at, latest_seen_at)
SELECT
  inferred.protocol,
  inferred.source_ip,
  inferred.latest_source_endpoint,
  inferred.platform_name,
  inferred.source_code,
  'PLATFORM',
  inferred.first_seen_at,
  inferred.latest_seen_at
FROM (` + jt808DataSourceInferenceSQL + `) inferred
LEFT JOIN vehicle_data_source ds
  ON ds.protocol = inferred.protocol
 AND ds.source_ip = inferred.source_ip
WHERE ` + jt808DataSourceCandidateWhereSQL + `
  AND ` + jt808DataSourceNeedsSyncWhereSQL + `
ON DUPLICATE KEY UPDATE
  latest_source_endpoint = VALUES(latest_source_endpoint),
  platform_name = CASE
    WHEN vehicle_data_source.platform_name IS NULL OR TRIM(vehicle_data_source.platform_name) = ''
      THEN VALUES(platform_name)
    ELSE vehicle_data_source.platform_name
  END,
  source_code = CASE
    WHEN vehicle_data_source.source_code IS NULL OR TRIM(vehicle_data_source.source_code) = ''
      THEN VALUES(source_code)
    ELSE vehicle_data_source.source_code
  END,
  source_kind = CASE
    WHEN vehicle_data_source.source_kind IS NULL OR TRIM(vehicle_data_source.source_kind) = '' OR vehicle_data_source.source_kind = 'UNKNOWN'
      THEN VALUES(source_kind)
    ELSE vehicle_data_source.source_kind
  END,
  enabled = CASE
    WHEN vehicle_data_source.enabled = 0
      AND (vehicle_data_source.remark LIKE 'auto-retired:%' OR vehicle_data_source.remark = 'auto-reenabled: source evidence restored')
      AND (
        (VALUES(platform_name) IS NOT NULL AND TRIM(VALUES(platform_name)) <> '')
        OR (VALUES(source_code) IS NOT NULL AND TRIM(VALUES(source_code)) <> '')
        OR VALUES(source_kind) <> 'UNKNOWN'
      )
      THEN 1
    ELSE vehicle_data_source.enabled
  END,
  remark = CASE
    WHEN vehicle_data_source.enabled = 0
      AND (vehicle_data_source.remark LIKE 'auto-retired:%' OR vehicle_data_source.remark = 'auto-reenabled: source evidence restored')
      AND (
        (VALUES(platform_name) IS NOT NULL AND TRIM(VALUES(platform_name)) <> '')
        OR (VALUES(source_code) IS NOT NULL AND TRIM(VALUES(source_code)) <> '')
        OR VALUES(source_kind) <> 'UNKNOWN'
      )
      THEN 'auto-reenabled: source evidence restored'
    ELSE vehicle_data_source.remark
  END,
  first_seen_at = COALESCE(vehicle_data_source.first_seen_at, VALUES(first_seen_at)),
  latest_seen_at = GREATEST(COALESCE(vehicle_data_source.latest_seen_at, VALUES(latest_seen_at)), VALUES(latest_seen_at)),
  updated_at = CURRENT_TIMESTAMP
`

const reprojectSelectableDailyMileageSourcesSQL = `
SELECT DISTINCT s.vin, s.stat_date, s.protocol
FROM vehicle_daily_mileage_source s
LEFT JOIN vehicle_data_source ds
  ON ds.protocol = s.protocol AND ds.source_ip = s.source_ip
LEFT JOIN vehicle_daily_mileage m
  ON m.vin = s.vin AND m.stat_date = s.stat_date AND m.protocol = s.protocol
WHERE s.protocol = 'JT808'
  AND s.quality_status = 'OK'
  AND (ds.id IS NULL OR ds.enabled = 1 OR (
    COALESCE(NULLIF(TRIM(ds.source_kind), ''), 'UNKNOWN') = 'UNKNOWN'
    AND (ds.source_code IS NULL OR TRIM(ds.source_code) = '')
    AND (ds.platform_name IS NULL OR TRIM(ds.platform_name) = '')
  ))
  AND (
    m.vin IS NULL
    OR NOT EXISTS (
      SELECT 1
      FROM vehicle_daily_mileage_source selected
      WHERE selected.vin = s.vin
        AND selected.stat_date = s.stat_date
        AND selected.protocol = s.protocol
        AND selected.is_selected = 1
    )
  )
ORDER BY s.stat_date DESC, s.vin ASC
`

const syncJT808DataSourcesCandidateCountSQL = `
SELECT COUNT(*)
FROM (` + jt808DataSourceInferenceSQL + `) inferred
LEFT JOIN vehicle_data_source ds
  ON ds.protocol = inferred.protocol
 AND ds.source_ip = inferred.source_ip
WHERE ` + jt808DataSourceCandidateWhereSQL + `
  AND ` + jt808DataSourceNeedsSyncWhereSQL

const syncJT808DataSourcesSkippedCountSQL = `
SELECT COUNT(*)
FROM (` + jt808DataSourceInferenceSQL + `) inferred
WHERE inferred.source_ip IS NOT NULL
  AND inferred.source_ip <> ''
  AND inferred.platform_name IS NOT NULL
  AND inferred.platform_name <> ''
  AND NOT (` + jt808DataSourceCandidateWhereSQL + `)`

const syncJT808DataSourcesConflictCountSQL = `
SELECT COUNT(*)
FROM (` + jt808DataSourceInferenceSQL + `) inferred
JOIN vehicle_data_source ds
  ON ds.protocol = inferred.protocol
 AND ds.source_ip = inferred.source_ip
WHERE ` + jt808DataSourceCandidateWhereSQL + `
  AND ds.source_code IS NOT NULL
  AND TRIM(ds.source_code) <> ''
  AND ds.source_code <> inferred.source_code`

const classifyConfiguredDataSourcesWhereSQL = `
  (source_kind IS NULL OR TRIM(source_kind) = '' OR source_kind = 'UNKNOWN')
  AND (
    (source_code IS NOT NULL AND TRIM(source_code) <> '')
    OR (platform_name IS NOT NULL AND TRIM(platform_name) <> '')
  )`

const classifyConfiguredDataSourcesCountSQL = `
SELECT COUNT(*)
FROM vehicle_data_source
WHERE ` + classifyConfiguredDataSourcesWhereSQL

const classifyConfiguredDataSourcesSQL = `
UPDATE vehicle_data_source
SET source_kind = 'PLATFORM',
    updated_at = CURRENT_TIMESTAMP
WHERE ` + classifyConfiguredDataSourcesWhereSQL

const pruneUnmanagedDataSourcesWhereSQL = `
  (ds.platform_name IS NULL OR TRIM(ds.platform_name) = '')
  AND (ds.source_code IS NULL OR TRIM(ds.source_code) = '')
  AND (ds.source_kind IS NULL OR TRIM(ds.source_kind) = '' OR ds.source_kind = 'UNKNOWN')
  AND TIMESTAMPDIFF(SECOND, COALESCE(ds.latest_seen_at, ds.updated_at, ds.created_at), CURRENT_TIMESTAMP) >= ?
  AND NOT EXISTS (
    SELECT 1
    FROM vehicle_daily_mileage m
    WHERE m.source_id = ds.id
    LIMIT 1
  )
  AND NOT EXISTS (
    SELECT 1
    FROM jt808_registration r
    WHERE ds.protocol = 'JT808'
      AND r.source_ip = ds.source_ip
    LIMIT 1
  )`

const pruneUnmanagedDataSourcesCountSQL = `
SELECT COUNT(*)
FROM vehicle_data_source ds
WHERE ` + pruneUnmanagedDataSourcesWhereSQL

const pruneUnmanagedDataSourcesSQL = `
DELETE ds
FROM vehicle_data_source ds
WHERE ` + pruneUnmanagedDataSourcesWhereSQL

const retireStaleUnmanagedDataSourcesWhereSQL = `
  ds.enabled = 1
  AND (ds.platform_name IS NULL OR TRIM(ds.platform_name) = '')
  AND (ds.source_code IS NULL OR TRIM(ds.source_code) = '')
  AND (ds.source_kind IS NULL OR TRIM(ds.source_kind) = '' OR ds.source_kind = 'UNKNOWN')
  AND TIMESTAMPDIFF(SECOND, COALESCE(ds.latest_seen_at, ds.updated_at, ds.created_at), CURRENT_TIMESTAMP) >= ?
  AND NOT EXISTS (
    SELECT 1
    FROM jt808_registration r
    WHERE ds.protocol = 'JT808'
      AND r.source_ip = ds.source_ip
    LIMIT 1
  )`

const retireStaleUnmanagedDataSourcesCountSQL = `
SELECT COUNT(*)
FROM vehicle_data_source ds
WHERE ` + retireStaleUnmanagedDataSourcesWhereSQL

const retireStaleUnmanagedDataSourcesSQL = `
UPDATE vehicle_data_source ds
SET enabled = 0,
    remark = CASE
      WHEN remark IS NULL OR TRIM(remark) = ''
        THEN 'auto-retired: stale unmanaged source without registration evidence'
      ELSE remark
    END,
    updated_at = CURRENT_TIMESTAMP
WHERE ` + retireStaleUnmanagedDataSourcesWhereSQL

func fail(err error) {
	_, _ = fmt.Fprintln(os.Stderr, err)
	os.Exit(1)
}